Hi Zaren,

1. Yes you need police certs. from Nepal and USA- FBI+State.

2. IELT S - Yes it is must for all whose native tounge is not english.

3 Buffalo CIC if you want to apply from US or New delhi from Nepal

4. Yes , all docs you send to CIC should be Notarized, just find one notary public in your Area.

5.Yes, all pages of passport ,you and your spouse notarized.

However,Police cert and Ielts can be submitted later when asked but mention them that you are planning to do it in near future .

Good Luck.